+char *quote822(const char *s, int force);
+char *mime_to_qp(const char *text);
+const char *mime_encode_text(const char *text,
+ const char **charsetp,
+ const char **encodingp);
+const char *mime_parse_word(const char *s, char **valuep,
+ int (*special)(int));
+int mime_http_separator(int c);
+int mime_tspecial(int c);